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#Author: OMKAR PATHAK

#This program illustrates an example of Stack implementation

#Stack Operations: push(), pop(), isEmpty(), peek(), stackSize()

class Stack(object):

def __init__(self, size):

self.index = []

self.size = size

def __str__(self):

myString = ' '.join(str(i) for i in self.index)

return myString

def push(self, data):

''' Pushes a element to top of the stack '''

if(self.isFull() != True):

self.index.append(data)

else:

print('Stack overflow')

def pop(self):

''' Pops the top element '''

if(self.isEmpty() != True):

return self.index.pop()

else:

print('Stack is already empty!')

def isEmpty(self):

''' Checks whether the stack is empty '''

return len(self.index) == []

def isFull(self):

''' Checks whether the stack if full '''

return len(self.index) == self.size

def peek(self):

''' Returns the top element of the stack '''

if(self.isEmpty() != True):

return self.index[-1]

else:

print('Stack is already empty!')

def stackSize(self):

''' Returns the current stack size '''

return len(self.index)

if __name__ == '__main__':

myStack = Stack(10)

for i in range(0, 10):

myStack.push(i)

print(myStack.isEmpty()) # False

print(myStack.isFull()) # True

print(myStack) # 0 1 2 3 4 5 6 7 8 9

print(myStack.stackSize()) # 10

print(myStack.pop()) # 9

print(myStack) # 0 1 2 3 4 5 6 7 8

print(myStack.peek()) # 8